KURVS: chemical properties from multiple strong line calibrations for star-forming galaxies at <i>z</i> ~ 1.5

ABSTRACT Gas-phase oxygen abundance (metallicity) properties can be constrained through emission line analyses, and are of great importance to investigate galaxy evolution histories. We present an analysis of the integrated and spatially resolved rest-frame optical emission line properties of the ionized gas in 43 star-forming galaxies at $z\sim 1.5$ in the K-band Multi Object Spectrograph Ultra-deep Rotational Velocity Survey. Using the [N ii]$\lambda 6584$/H $\alpha$ (N2), ([O ii]$\lambda \lambda 3727,9+$[O iii]$\lambda \lambda 4959,5007$)/H $\beta$ (R23), and for the first time [N ii]$\lambda 6584$/[O ii]$\lambda \lambda 3727,9$ (N2O2) indicators at this redshift, we measure the gas-phase metallicities and their radial gradients. On $\sim 4$-kpc scales metallicity gradients measured from N2O2 and those measured from N2 are in good agreement when considering the spatial distributions of dust in each galaxy, as parametrized by dust attenuation radial gradients. We report a nearly flat metallicity gradient distribution typically at $z\sim 1.5$, with the 50th, 16th, and 84th percentiles at 0.01, $-0.03$, and 0.05 dex kpc$^{-1}$, respectively. The findings agree well with previous observational studies and simulations at this epoch. We ascribe the observed negative metallicity gradients to a natural result from self-regulating systems, and the positive ones to potential galactic fountains and higher merger rates.

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Journal
Monthly Notices of the Royal Astronomical Society
Published
2025-11-06
DOI
https://doi.org/10.1093/mnras/staf1919
Primary Topic
Galaxies: Formation, Evolution, Phenomena
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article
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article

KURVS: chemical properties from multiple strong line calibrations for star-forming galaxies at z ~ 1.5

Juan Molina, Annagrazia Puglisi, C. M. Harrison, U Dudzevičiūtė et al.
Monthly Notices of the Royal Astronomical Society
Galaxies: Formation, Evolution, Phenomena
article

KURVS: chemical properties from multiple strong line calibrations for star-forming galaxies at z ~ 1.5

Juan Molina, Annagrazia Puglisi, C. M. Harrison, U Dudzevičiūtė, Karl Glazebrook, L. Cortese, Ian Smail, Anna F. McLeod, Dominic J. Taylor, A. M. Swinbank, Zefeng Li, Steven Gillman, Danail Obreschkow, Tom Theuns, Roland Bacon, E. Ibar
article en

Abstract

ABSTRACT Gas-phase oxygen abundance (metallicity) properties can be constrained through emission line analyses, and are of great importance to investigate galaxy evolution histories. We present an analysis of the integrated and spatially resolved rest-frame optical emission line properties of the ionized gas in 43 star-forming galaxies at $z\sim 1.5$ in the K-band Multi Object Spectrograph Ultra-deep Rotational Velocity Survey. Using the [N ii]$\lambda 6584$/H $\alpha$ (N2), ([O ii]$\lambda \lambda 3727,9+$[O iii]$\lambda \lambda 4959,5007$)/H $\beta$ (R23), and for the first time [N ii]$\lambda 6584$/[O ii]$\lambda \lambda 3727,9$ (N2O2) indicators at this redshift, we measure the gas-phase metallicities and their radial gradients. On $\sim 4$-kpc scales metallicity gradients measured from N2O2 and those measured from N2 are in good agreement when considering the spatial distributions of dust in each galaxy, as parametrized by dust attenuation radial gradients. We report a nearly flat metallicity gradient distribution typically at $z\sim 1.5$, with the 50th, 16th, and 84th percentiles at 0.01, $-0.03$, and 0.05 dex kpc$^{-1}$, respectively. The findings agree well with previous observational studies and simulations at this epoch. We ascribe the observed negative metallicity gradients to a natural result from self-regulating systems, and the positive ones to potential galactic fountains and higher merger rates.

Monthly Notices of the Royal Astronomical SocietyVol. 544(4)
Université Claude Bernard Lyon 1 (FR), École Normale Supérieure de Lyon (FR), Centre National de la Recherche Scientifique (FR), The University of Western Australia (AU), Lyon College (US), Durham University (GB), Observatoire de Lyon (FR), Centre de Recherche Astrophysique de Lyon (FR), Galaxies, Etoiles, Physique et Instrumentation (FR), Max Planck Institute for Astronomy (DE), DAWN Center for Independent Living (US), Millennium Engineering and Integration (United States) (US), Millenium Nucleus for Planet Formation (CL), International Centre for Radio Astronomy Research (AU), University of Southampton (GB), Swinburne University of Technology (AU), University of Valparaíso (CL), Newcastle University (GB), Technical University of Denmark (DK)
Openalex Percentile: Top 77%
Galaxies: Formation, Evolution, Phenomena
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